[PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[Abd-Alrhman Masalkhi]

I have compiled the kernel with a cross compiler "hppa-linux-gnu-" on
x86-64 host machine. I got the follwing warning:

block/genhd.c: In function ‘diskstats_show’:
block/genhd.c:1227:1: warning: the frame size of 1688 bytes is larger
than 1280 bytes [-Wframe-larger-than=]
 1227  |  }

The problem was calling seq_printf function with too long argumnets list.
Therefore, I cut it into two halves. For the second half I have defined
a function called "print_disk_stats" to print the states of the disk.

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
---
 block/genhd.c | 75 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 41 insertions(+), 34 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9f8cb7beaad1..caf5ac8b509f 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1151,6 +1151,44 @@ const struct device_type disk_type = {
 };
 
 #ifdef CONFIG_PROC_FS
+
+void print_disk_stats(struct seq_file *seqf,
+		      unsigned int inflight, struct disk_stats *stat)
+{
+	seq_printf(seqf, "%lu %lu %lu %u "
+		   "%lu %lu %lu %u "
+		   "%u %u %u "
+		   "%lu %lu %lu %u "
+		   "%lu %u"
+		   "\n",
+		   stat->ios[STAT_READ],
+		   stat->merges[STAT_READ],
+		   stat->sectors[STAT_READ],
+		   (unsigned int)div_u64(stat->nsecs[STAT_READ],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_WRITE],
+		   stat->merges[STAT_WRITE],
+		   stat->sectors[STAT_WRITE],
+		   (unsigned int)div_u64(stat->nsecs[STAT_WRITE],
+					 NSEC_PER_MSEC),
+		   inflight,
+		   jiffies_to_msecs(stat->io_ticks),
+		   (unsigned int)div_u64(stat->nsecs[STAT_READ] +
+					 stat->nsecs[STAT_WRITE] +
+					 stat->nsecs[STAT_DISCARD] +
+					 stat->nsecs[STAT_FLUSH],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_DISCARD],
+		   stat->merges[STAT_DISCARD],
+		   stat->sectors[STAT_DISCARD],
+		   (unsigned int)div_u64(stat->nsecs[STAT_DISCARD],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_FLUSH],
+		   (unsigned int)div_u64(stat->nsecs[STAT_FLUSH],
+					 NSEC_PER_MSEC)
+		);
+}
+
 /*
  * aggregate disk stat collector.  Uses the same stats that the sysfs
  * entries do, above, but makes them available through one seq_file.
@@ -1185,41 +1223,10 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 		else
 			inflight = part_in_flight(hd);
 
-		seq_printf(seqf, "%4d %7d %s "
-			   "%lu %lu %lu %u "
-			   "%lu %lu %lu %u "
-			   "%u %u %u "
-			   "%lu %lu %lu %u "
-			   "%lu %u"
-			   "\n",
+		seq_printf(seqf, "%4d %7d %s ",
 			   MAJOR(hd->bd_dev), MINOR(hd->bd_dev),
-			   disk_name(gp, hd->bd_partno, buf),
-			   stat.ios[STAT_READ],
-			   stat.merges[STAT_READ],
-			   stat.sectors[STAT_READ],
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ],
-							NSEC_PER_MSEC),
-			   stat.ios[STAT_WRITE],
-			   stat.merges[STAT_WRITE],
-			   stat.sectors[STAT_WRITE],
-			   (unsigned int)div_u64(stat.nsecs[STAT_WRITE],
-							NSEC_PER_MSEC),
-			   inflight,
-			   jiffies_to_msecs(stat.io_ticks),
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ] +
-						 stat.nsecs[STAT_WRITE] +
-						 stat.nsecs[STAT_DISCARD] +
-						 stat.nsecs[STAT_FLUSH],
-							NSEC_PER_MSEC),
-			   stat.ios[STAT_DISCARD],
-			   stat.merges[STAT_DISCARD],
-			   stat.sectors[STAT_DISCARD],
-			   (unsigned int)div_u64(stat.nsecs[STAT_DISCARD],
-						 NSEC_PER_MSEC),
-			   stat.ios[STAT_FLUSH],
-			   (unsigned int)div_u64(stat.nsecs[STAT_FLUSH],
-						 NSEC_PER_MSEC)
-			);
+			   disk_name(gp, hd->bd_partno, buf));
+		print_disk_stats(seqf, inflight, &stat);
 	}
 	rcu_read_unlock();
 
-- 
2.29.0.rc1.dirty

Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[kernel test robot]

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Hi Abd-Alrhman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on v5.13 next-20210630]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/749f487a31d6818dadc37ba729475d0486daf81c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
        git checkout 749f487a31d6818dadc37ba729475d0486daf81c
        # save the attached .config to linux build tree
        make W=1 ARCH=um SUBARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> block/genhd.c:1110:6: warning: no previous prototype for 'print_disk_stats' [-Wmissing-prototypes]
    1110 | void print_disk_stats(struct seq_file *seqf,
         |      ^~~~~~~~~~~~~~~~


vim +/print_disk_stats +1110 block/genhd.c

  1109	
> 1110	void print_disk_stats(struct seq_file *seqf,
  1111			      unsigned int inflight, struct disk_stats *stat)
  1112	{
  1113		seq_printf(seqf, "%lu %lu %lu %u "
  1114			   "%lu %lu %lu %u "
  1115			   "%u %u %u "
  1116			   "%lu %lu %lu %u "
  1117			   "%lu %u"
  1118			   "\n",
  1119			   stat->ios[STAT_READ],
  1120			   stat->merges[STAT_READ],
  1121			   stat->sectors[STAT_READ],
  1122			   (unsigned int)div_u64(stat->nsecs[STAT_READ],
  1123						 NSEC_PER_MSEC),
  1124			   stat->ios[STAT_WRITE],
  1125			   stat->merges[STAT_WRITE],
  1126			   stat->sectors[STAT_WRITE],
  1127			   (unsigned int)div_u64(stat->nsecs[STAT_WRITE],
  1128						 NSEC_PER_MSEC),
  1129			   inflight,
  1130			   jiffies_to_msecs(stat->io_ticks),
  1131			   (unsigned int)div_u64(stat->nsecs[STAT_READ] +
  1132						 stat->nsecs[STAT_WRITE] +
  1133						 stat->nsecs[STAT_DISCARD] +
  1134						 stat->nsecs[STAT_FLUSH],
  1135						 NSEC_PER_MSEC),
  1136			   stat->ios[STAT_DISCARD],
  1137			   stat->merges[STAT_DISCARD],
  1138			   stat->sectors[STAT_DISCARD],
  1139			   (unsigned int)div_u64(stat->nsecs[STAT_DISCARD],
  1140						 NSEC_PER_MSEC),
  1141			   stat->ios[STAT_FLUSH],
  1142			   (unsigned int)div_u64(stat->nsecs[STAT_FLUSH],
  1143						 NSEC_PER_MSEC)
  1144			);
  1145	}
  1146	

---
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https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 8054 bytes --]

Hi Abd-Alrhman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on v5.13 next-20210630]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: s390-randconfig-r014-20210630 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8d21d5472501460933e78aead04cf59579025ba4)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install s390 cross compiling tool for clang build
        # apt-get install binutils-s390x-linux-gnu
        # https://github.com/0day-ci/linux/commit/749f487a31d6818dadc37ba729475d0486daf81c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
        git checkout 749f487a31d6818dadc37ba729475d0486daf81c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from block/genhd.c:14:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __raw_readb(PCI_IOBASE + addr);
                             ~~~~~~~~~~ ^
   include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:36:59: note: expanded from macro '__le16_to_cpu'
   #define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
                                                             ^
   include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
   #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
                                                        ^
   In file included from block/genhd.c:14:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
                                                           ~~~~~~~~~~ ^
   include/uapi/linux/byteorder/big_endian.h:34:59: note: expanded from macro '__le32_to_cpu'
   #define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
                                                             ^
   include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
   #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
                                                        ^
   In file included from block/genhd.c:14:
   In file included from include/linux/blkdev.h:25:
   In file included from include/linux/scatterlist.h:9:
   In file included from arch/s390/include/asm/io.h:75:
   include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writeb(value, PCI_IOBASE + addr);
                               ~~~~~~~~~~ ^
   include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           __raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
                                                         ~~~~~~~~~~ ^
   include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsb(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsw(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           readsl(PCI_IOBASE + addr, buffer, count);
                  ~~~~~~~~~~ ^
   include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesb(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesw(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
   include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
           writesl(PCI_IOBASE + addr, buffer, count);
                   ~~~~~~~~~~ ^
>> block/genhd.c:1110:6: warning: no previous prototype for function 'print_disk_stats' [-Wmissing-prototypes]
   void print_disk_stats(struct seq_file *seqf,
        ^
   block/genhd.c:1110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
   void print_disk_stats(struct seq_file *seqf,
   ^
   static 
   13 warnings generated.


vim +/print_disk_stats +1110 block/genhd.c

  1109	
> 1110	void print_disk_stats(struct seq_file *seqf,
  1111			      unsigned int inflight, struct disk_stats *stat)
  1112	{
  1113		seq_printf(seqf, "%lu %lu %lu %u "
  1114			   "%lu %lu %lu %u "
  1115			   "%u %u %u "
  1116			   "%lu %lu %lu %u "
  1117			   "%lu %u"
  1118			   "\n",
  1119			   stat->ios[STAT_READ],
  1120			   stat->merges[STAT_READ],
  1121			   stat->sectors[STAT_READ],
  1122			   (unsigned int)div_u64(stat->nsecs[STAT_READ],
  1123						 NSEC_PER_MSEC),
  1124			   stat->ios[STAT_WRITE],
  1125			   stat->merges[STAT_WRITE],
  1126			   stat->sectors[STAT_WRITE],
  1127			   (unsigned int)div_u64(stat->nsecs[STAT_WRITE],
  1128						 NSEC_PER_MSEC),
  1129			   inflight,
  1130			   jiffies_to_msecs(stat->io_ticks),
  1131			   (unsigned int)div_u64(stat->nsecs[STAT_READ] +
  1132						 stat->nsecs[STAT_WRITE] +
  1133						 stat->nsecs[STAT_DISCARD] +
  1134						 stat->nsecs[STAT_FLUSH],
  1135						 NSEC_PER_MSEC),
  1136			   stat->ios[STAT_DISCARD],
  1137			   stat->merges[STAT_DISCARD],
  1138			   stat->sectors[STAT_DISCARD],
  1139			   (unsigned int)div_u64(stat->nsecs[STAT_DISCARD],
  1140						 NSEC_PER_MSEC),
  1141			   stat->ios[STAT_FLUSH],
  1142			   (unsigned int)div_u64(stat->nsecs[STAT_FLUSH],
  1143						 NSEC_PER_MSEC)
  1144			);
  1145	}
  1146	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 1756 bytes --]

Hi Abd-Alrhman,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on block/for-next]
[also build test WARNING on v5.13 next-20210630]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
base:   https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-next
config: i386-randconfig-s002-20210630 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://github.com/0day-ci/linux/commit/749f487a31d6818dadc37ba729475d0486daf81c
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Abd-Alrhman-Masalkhi/block-Removed-a-warning-while-compiling-with-a-cross-compiler-for-parisc/20210630-161407
        git checkout 749f487a31d6818dadc37ba729475d0486daf81c
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> block/genhd.c:1110:6: sparse: sparse: symbol 'print_disk_stats' was not declared. Should it be static?

Please review and possibly fold the followup patch.

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

[-- Attachment #2: .config.gz --]
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[RFC PATCH] block: print_disk_stats() can be static

[kernel test robot]

block/genhd.c:1110:6: warning: symbol 'print_disk_stats' was not declared. Should it be static?

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: kernel test robot <lkp@intel.com>
---
 genhd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 5d393b2bc62c3..803c3448f09ae 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1107,8 +1107,8 @@ const struct device_type disk_type = {
 
 #ifdef CONFIG_PROC_FS
 
-void print_disk_stats(struct seq_file *seqf,
-		      unsigned int inflight, struct disk_stats *stat)
+static void print_disk_stats(struct seq_file *seqf,
+			     unsigned int inflight, struct disk_stats *stat)
 {
 	seq_printf(seqf, "%lu %lu %lu %u "
 		   "%lu %lu %lu %u "

[PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[Abd-Alrhman Masalkhi]

I have compiled the kernel with a cross compiler "hppa-linux-gnu-" v9.3.0
on x86-64 host machine. I got the following warning:

block/genhd.c: In function ‘diskstats_show’:
block/genhd.c:1227:1: warning: the frame size of 1688 bytes is larger
than 1280 bytes [-Wframe-larger-than=]
 1227  |  }

The problem was calling seq_printf function with too long argumnets list.
Therefore, I cut it into two halves. For the second half I have defined
a function called "print_disk_stats" to print the states of the disk.

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
---
 block/genhd.c | 74 ++++++++++++++++++++++++++++-----------------------
 1 file changed, 40 insertions(+), 34 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 9f8cb7beaad1..64846aec76c0 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1151,6 +1151,43 @@ const struct device_type disk_type = {
 };
 
 #ifdef CONFIG_PROC_FS
+static void print_disk_stats(struct seq_file *seqf,
+			     unsigned int inflight, struct disk_stats *stat)
+{
+	seq_printf(seqf, "%lu %lu %lu %u "
+		   "%lu %lu %lu %u "
+		   "%u %u %u "
+		   "%lu %lu %lu %u "
+		   "%lu %u"
+		   "\n",
+		   stat->ios[STAT_READ],
+		   stat->merges[STAT_READ],
+		   stat->sectors[STAT_READ],
+		   (unsigned int)div_u64(stat->nsecs[STAT_READ],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_WRITE],
+		   stat->merges[STAT_WRITE],
+		   stat->sectors[STAT_WRITE],
+		   (unsigned int)div_u64(stat->nsecs[STAT_WRITE],
+					 NSEC_PER_MSEC),
+		   inflight,
+		   jiffies_to_msecs(stat->io_ticks),
+		   (unsigned int)div_u64(stat->nsecs[STAT_READ] +
+					 stat->nsecs[STAT_WRITE] +
+					 stat->nsecs[STAT_DISCARD] +
+					 stat->nsecs[STAT_FLUSH],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_DISCARD],
+		   stat->merges[STAT_DISCARD],
+		   stat->sectors[STAT_DISCARD],
+		   (unsigned int)div_u64(stat->nsecs[STAT_DISCARD],
+					 NSEC_PER_MSEC),
+		   stat->ios[STAT_FLUSH],
+		   (unsigned int)div_u64(stat->nsecs[STAT_FLUSH],
+					 NSEC_PER_MSEC)
+		);
+}
+
 /*
  * aggregate disk stat collector.  Uses the same stats that the sysfs
  * entries do, above, but makes them available through one seq_file.
@@ -1185,41 +1222,10 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 		else
 			inflight = part_in_flight(hd);
 
-		seq_printf(seqf, "%4d %7d %s "
-			   "%lu %lu %lu %u "
-			   "%lu %lu %lu %u "
-			   "%u %u %u "
-			   "%lu %lu %lu %u "
-			   "%lu %u"
-			   "\n",
+		seq_printf(seqf, "%4d %7d %s ",
 			   MAJOR(hd->bd_dev), MINOR(hd->bd_dev),
-			   disk_name(gp, hd->bd_partno, buf),
-			   stat.ios[STAT_READ],
-			   stat.merges[STAT_READ],
-			   stat.sectors[STAT_READ],
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ],
-							NSEC_PER_MSEC),
-			   stat.ios[STAT_WRITE],
-			   stat.merges[STAT_WRITE],
-			   stat.sectors[STAT_WRITE],
-			   (unsigned int)div_u64(stat.nsecs[STAT_WRITE],
-							NSEC_PER_MSEC),
-			   inflight,
-			   jiffies_to_msecs(stat.io_ticks),
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ] +
-						 stat.nsecs[STAT_WRITE] +
-						 stat.nsecs[STAT_DISCARD] +
-						 stat.nsecs[STAT_FLUSH],
-							NSEC_PER_MSEC),
-			   stat.ios[STAT_DISCARD],
-			   stat.merges[STAT_DISCARD],
-			   stat.sectors[STAT_DISCARD],
-			   (unsigned int)div_u64(stat.nsecs[STAT_DISCARD],
-						 NSEC_PER_MSEC),
-			   stat.ios[STAT_FLUSH],
-			   (unsigned int)div_u64(stat.nsecs[STAT_FLUSH],
-						 NSEC_PER_MSEC)
-			);
+			   disk_name(gp, hd->bd_partno, buf));
+		print_disk_stats(seqf, inflight, &stat);
 	}
 	rcu_read_unlock();
 
-- 
2.29.0.rc1.dirty

Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[Christoph Hellwig]

I think the proper fix is the to apply the

"reduce stack footprint printing bdev names"

series and then just use the new printf specifier to print the bdevname.

Re: [PATCH] block: Removed a warning while compiling with a cross compiler for parisc

[Abd-Alrhman Masalkhi]

Thank you Christoph for your comment, you are absolutely right, my previous
solution has not actually solved the problem... I have not know about %pg,
it is a nice feature, I hope I have used correctly!! and about div_u64 I
have found out that each time div_u64 was used the stack frame increased
dramatically, so I wrapped with a wrapper function and used the noinline
attribute, and if there is any mistakes or if i have do not something not
correct I am happy to hear them.
And I am sorry for the late respond, I was at work, delivering pizza. next
time, if you have ordered a pizza and I was the deliver, it will be on me.

Thank you again!

Kind Regards,
Abd-Alrhman,

Signed-off-by: Abd-Alrhman Masalkhi <abd.masalkhi@gmail.com>
---
 block/genhd.c | 35 ++++++++++++++++++-----------------
 1 file changed, 18 insertions(+), 17 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 79aa40b4c39c..c32b7716381a 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1106,6 +1106,12 @@ const struct device_type disk_type = {
 };
 
 #ifdef CONFIG_PROC_FS
+
+static noinline unsigned int call_div_u64(u64 dividend, u32 divisor)
+{
+	return (unsigned int)div_u64(dividend, divisor);
+}
+
 /*
  * aggregate disk stat collector.  Uses the same stats that the sysfs
  * entries do, above, but makes them available through one seq_file.
@@ -1117,7 +1123,6 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 {
 	struct gendisk *gp = v;
 	struct block_device *hd;
-	char buf[BDEVNAME_SIZE];
 	unsigned int inflight;
 	struct disk_stats stat;
 	unsigned long idx;
@@ -1140,40 +1145,36 @@ static int diskstats_show(struct seq_file *seqf, void *v)
 		else
 			inflight = part_in_flight(hd);
 
-		seq_printf(seqf, "%4d %7d %s "
+		seq_printf(seqf, "%4d %7d %pg "
 			   "%lu %lu %lu %u "
 			   "%lu %lu %lu %u "
 			   "%u %u %u "
 			   "%lu %lu %lu %u "
 			   "%lu %u"
 			   "\n",
-			   MAJOR(hd->bd_dev), MINOR(hd->bd_dev),
-			   disk_name(gp, hd->bd_partno, buf),
+			   MAJOR(hd->bd_dev), MINOR(hd->bd_dev), gp,
 			   stat.ios[STAT_READ],
 			   stat.merges[STAT_READ],
 			   stat.sectors[STAT_READ],
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ],
-							NSEC_PER_MSEC),
+			   call_div_u64(stat.nsecs[STAT_READ], NSEC_PER_MSEC),
 			   stat.ios[STAT_WRITE],
 			   stat.merges[STAT_WRITE],
 			   stat.sectors[STAT_WRITE],
-			   (unsigned int)div_u64(stat.nsecs[STAT_WRITE],
-							NSEC_PER_MSEC),
+			   call_div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC),
 			   inflight,
 			   jiffies_to_msecs(stat.io_ticks),
-			   (unsigned int)div_u64(stat.nsecs[STAT_READ] +
-						 stat.nsecs[STAT_WRITE] +
-						 stat.nsecs[STAT_DISCARD] +
-						 stat.nsecs[STAT_FLUSH],
-							NSEC_PER_MSEC),
+			   call_div_u64(stat.nsecs[STAT_READ] +
+					stat.nsecs[STAT_WRITE] +
+					stat.nsecs[STAT_DISCARD] +
+					stat.nsecs[STAT_FLUSH],
+					NSEC_PER_MSEC),
 			   stat.ios[STAT_DISCARD],
 			   stat.merges[STAT_DISCARD],
 			   stat.sectors[STAT_DISCARD],
-			   (unsigned int)div_u64(stat.nsecs[STAT_DISCARD],
-						 NSEC_PER_MSEC),
+			   call_div_u64(stat.nsecs[STAT_DISCARD],
+					NSEC_PER_MSEC),
 			   stat.ios[STAT_FLUSH],
-			   (unsigned int)div_u64(stat.nsecs[STAT_FLUSH],
-						 NSEC_PER_MSEC)
+			   call_div_u64(stat.nsecs[STAT_FLUSH], NSEC_PER_MSEC)
 			);
 	}
 	rcu_read_unlock();
-- 
2.29.0.rc1.dirty